The reason your compact disc player won't work is because it needs a replacement laser"they do wear out". The pot on the laser shold not be ajusted it is factory set and nothing can be gained by ajusting ,What you can do to cure a suspect laser is to blow dust out using aerosol compressed air and clean lens with a cotton bud,this proccess should always be carried out first before suspecting something more sinister.
hope this helps. westronic95@aol.com
Doug
September 2003